The objective of this title is to outline the neurobiology of post-traumatic stress disorder and provide treatment strategies for clinicians. The chapter material from this book has evolved from a seminar on PTSD held recently under the auspices of the VA Boston Healthcare System, Boston University Medical Center and Harvard Medical School. We propose a book that will focus on the epidemiology, neurobiology, MRI studies, animal models, arousal and sleep issues, clinical trials, and treatment strategies for clinicians. Treatment will cover such topics as guidelines for treating posttraumatic stress disorder, PTSD and the use of mental health services, cognitive intervention therapy, and large scale clinical trials in PTSD.